Eggplant borer, also known as eggplant borer, eggplant borer. The adult is 6.5 ~ 10 mm long, with wings spread 18 ~ 32 mm, white body and wings, four obvious yellow stripes on the front wings, yellow-brown wings at the base, red triangular stripes near the rear edge and black eye lines below the apex angle. There is a small black spot in the cavity of the hind wing. The egg is 0.7 mm× 0.4 mm, shaped like a jiaozi, with 2 ~ 5 teeth on its ridge. It is milky white at birth and grayish black before hatching. The mature larvae are 16 ~ 18 mm in length, yellow and white in early stage and pink in old age. The back plate of the head and chest is dark brown, with six dark brown spots on each section, the first four are big and the last two are small, and each section has a protrusion on both sides and two bristles. Pupa is 8 ~ 9 mm long and light yellow-brown. There are a pair of protrusions above the stomata on both sides of the abdomen 3 ~ 4, which are covered with dark brown irregular cocoons, which are white at first and gradually become dark brown or brownish red.
Eggplant borers do harm to eggplant, and their larvae eat the top, tender shoots, tender stems, flower buds and fruits of eggplant, resulting in shoot withering, flower dropping, fruit dropping and fruit rot. In autumn, larvae often eat fruits, and insect droppings are left outside the hole. Kandelia candel suffers more than spring eggplant.
There are 5-6 generations in Wuhan, and 4 generations in Jiangxi and Zhejiang every year. Mature larvae form thin cocoons and attach to branches, dead leaves, rhizosphere of weeds and gaps on soil surface for wintering. Pupation began in April of the following year, and generally larvae began to appear in May, with overlapping generations. The damage was most serious from July to September, and the damage was most serious from mid-July to late August, that is, the second and third generations mainly harmed generations. Adults lie in the daytime and come out at night, with weak phototaxis and a green tendency. The eggs are scattered in the middle and upper part of the dead plant, especially on the opposite side of the upper tender leaves. The newly hatched larvae eat eggshells first, then the buds and ovaries or the heart leaves, tender shoots and petioles. Generally, the flowers, buds and tender shoots of spring eggplant are seriously damaged, and the fruits of autumn eggplant are seriously damaged. In summer, most mature larvae pupate with overlapping green leaves in the middle and upper parts of dead plants, a few with dead leaves, and in autumn, they pupate with litter, weeds and soil cracks in the lower parts of dead plants.